(define (binary<? x1 x2)
  (< x1 x2))

(define (binary=? x1 x2)
  (= x1 x2))

(define (binary-add x1 x2)
  (+ x1 x2))

(define (binary-div x1 x2)
  (/ x1 x2))

(define (binary-mul x1 x2)
  (* x1 x2))

(define (binary-sub x1 x2)
  (- x1 x2))


